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Magellanic Clouds' Binaries as Distance Indicators (CROSBI ID 533476)

Prilog sa skupa u zborniku | sažetak izlaganja sa skupa

Dominis, Dijana ; Butler, Keith ; Simon, Klaus ; Clausen, Jens Viggo ; Pritchard, John Magellanic Clouds' Binaries as Distance Indicators // Astronomische Gesellschaft Abstract Series Vol. 18. American Geophysical Union (AGU), 2001. str. 25-x

Podaci o odgovornosti

Dominis, Dijana ; Butler, Keith ; Simon, Klaus ; Clausen, Jens Viggo ; Pritchard, John

engleski

Magellanic Clouds' Binaries as Distance Indicators

Detached eclipsing binary systems of B-type stars in the Large and Small Magellanic Clouds have been observed in order to determine distances to these galaxies. We obtained high resolution spectra using the UVES spectrograph at the VLT, ESO. Analysis of the spectra with strongly overlapping spectral lines, which are heavily broadened by the Stark effect and rotation, is only possible by means of the Disentangling Method. This allows us to not only determine accurate spectroscopic orbit parameters, but also the individual component spectra. In combination with high accuracy photometry we determine precise absolute dimensions of the components. Subsequent fine analyses of the component spectra by means of line blanketed model atmospheres and non-LTE line formation calculations yield independent photospheric parameters: effective temperature, gravity, and element abundances. While the element abundances will provide further constraints on the metallicity of the Magellanic Clouds, the spectroscopic effective temperature in combination with the binary parameters enables us to determine distances with unprecedented accuracy.

Eclipsing binary systems; B-type stars; spectroscopy

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Podaci o prilogu

25-x.

2001.

objavljeno

Podaci o matičnoj publikaciji

Astronomische Gesellschaft Abstract Series Vol. 18

American Geophysical Union (AGU)

Podaci o skupu

Annual Scientific Meeting of the Astronomische Gesellschaft at the Joint European and National Meeting JENAM 2001

predavanje

10.09.2001-15.09.2001

München, Njemačka

Povezanost rada

Fizika